*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 5rem;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
  font-size: 1rem;
  color: #1B2A27;
  background: #F5F0E6;
}

#main-content {
  display: block;
  flex: 1;
  width: 100%;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

address {
  font-style: normal;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Noto Serif SC", STSong, "Songti SC", serif;
  font-weight: 700;
  line-height: 1.3;
}

:focus-visible {
  outline: 2px solid #C9A227;
  outline-offset: 3px;
  border-radius: 2px;
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:root {
  --primary: #0A5C4A;
  --primary-deep: #043429;
  --gold: #C9A227;
  --gold-bright: #D7B64B;
  --gold-soft: rgba(201, 162, 39, 0.35);
  --crimson: #8E3A2B;
  --white: #FFFFFF;
  --vermilion: #D84B2B;
  --bright-yellow: #F5C518;
  --cream: #F5F0E6;
  --ink: #1B2A27;
  --mist: #E8E4D8;
  --font-title: "Noto Serif SC", STSong, "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", Consolas, monospace;
  --container-max: 1200px;
  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 2px 14px rgba(27, 42, 39, 0.07);
  --shadow-float: 0 10px 36px rgba(27, 42, 39, 0.16);
  --header-h: 72px;
}

.container {
  width: min(var(--container-max), 100%);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 640px) {
  .container {
    padding-inline: 2rem;
  }
}

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 1002;
  pointer-events: none;
  will-change: transform;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 1001;
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--gold);
  color: var(--primary-deep);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.4;
  transform: translateY(-300%);
  transition: transform 0.25s ease;
  box-shadow: 0 2px 10px rgba(27, 42, 39, 0.25);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--primary);
  color: var(--cream);
  border-bottom: 1px solid var(--gold-soft);
  transition: box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  box-shadow: 0 4px 20px rgba(4, 52, 41, 0.35);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0 1.5rem;
  min-height: var(--header-h);
}

/* Brand */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  padding: 0.5rem 0;
  color: var(--cream);
}

.site-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-title);
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1;
  transition: background 0.3s ease, color 0.3s ease;
}

.site-brand:hover .site-brand-mark {
  background: var(--gold);
  color: var(--primary-deep);
}

.site-brand-text {
  display: inline-flex;
  flex-direction: column;
  gap: 0.05rem;
}

.site-brand-name {
  font-family: var(--font-title);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.site-brand-tagline {
  display: inline-block;
  font-size: 0.68rem;
  color: var(--gold);
  border: 1px solid var(--gold-soft);
  padding: 0.08rem 0.45rem;
  border-radius: 999px;
  letter-spacing: 0.2em;
  line-height: 1.4;
  white-space: nowrap;
}

/* Nav toggle */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--gold-soft);
  background: rgba(255, 255, 255, 0.04);
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 22px;
  height: 18px;
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--cream);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: 0.5rem 0.65rem;
  color: rgba(245, 240, 230, 0.9);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.65rem;
  right: 0.65rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.3s ease;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
  color: var(--gold);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left center;
}

.header-download {
  margin-left: 0.25rem;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--primary);
  color: var(--cream);
  border-top: 2px solid var(--gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 3rem 0 2.5rem;
}

.footer-col-brand .footer-brand-name {
  font-family: var(--font-title);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.1em;
  line-height: 1.3;
}

.footer-slogan {
  color: var(--gold);
  font-size: 0.9rem;
  letter-spacing: 0.22em;
  margin-top: 0.35rem;
}

.footer-trust {
  color: rgba(245, 240, 230, 0.7);
  font-size: 0.85rem;
  line-height: 1.75;
  margin-top: 1.25rem;
  max-width: 34em;
  border-left: 2px solid var(--gold);
  padding-left: 1rem;
}

.footer-heading {
  font-family: var(--font-title);
  font-size: 1rem;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 0.14em;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gold-soft);
}

.footer-links li + li {
  margin-top: 0.45rem;
}

.footer-links a {
  display: inline-block;
  color: rgba(245, 240, 230, 0.8);
  font-size: 0.9rem;
  line-height: 1.6;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--gold-bright);
  padding-left: 0.35rem;
}

.footer-address {
  color: rgba(245, 240, 230, 0.8);
  font-size: 0.9rem;
  line-height: 1.85;
}

.footer-address a {
  color: var(--gold);
  transition: color 0.2s ease;
}

.footer-address a:hover,
.footer-address a:focus-visible {
  color: var(--gold-bright);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-bottom {
  background: rgba(4, 52, 41, 0.45);
  border-top: 1px solid rgba(245, 240, 230, 0.12);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}

.footer-copy {
  font-size: 0.825rem;
  color: rgba(245, 240, 230, 0.65);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.825rem;
}

.footer-legal a {
  color: rgba(245, 240, 230, 0.7);
  transition: color 0.2s ease;
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--gold-bright);
}

.footer-mail {
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}

.footer-icp {
  font-family: var(--font-mono);
  color: rgba(245, 240, 230, 0.55);
  letter-spacing: 0.02em;
}

.footer-sep {
  color: var(--gold);
  opacity: 0.45;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.925rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease,
    box-shadow 0.2s ease, transform 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-gold {
  background: var(--gold);
  color: var(--primary-deep);
  border-color: var(--gold);
}

.btn-gold:hover,
.btn-gold:focus-visible {
  background: var(--gold-bright);
  border-color: var(--gold-bright);
  box-shadow: 0 2px 14px rgba(201, 162, 39, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--gold);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: rgba(201, 162, 39, 0.1);
  border-color: var(--gold-bright);
  color: var(--primary-deep);
}

.btn-dark {
  background: var(--primary);
  color: var(--cream);
  border-color: var(--primary);
}

.btn-dark:hover,
.btn-dark:focus-visible {
  background: var(--primary-deep);
  border-color: var(--primary-deep);
}

.btn-sm {
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  border-radius: var(--radius-xs);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  padding: 1rem 0;
  font-size: 0.85rem;
  color: rgba(27, 42, 39, 0.6);
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.breadcrumbs-link {
  color: var(--primary);
  transition: color 0.2s ease;
}

.breadcrumbs-link:hover,
.breadcrumbs-link:focus-visible {
  color: var(--vermilion);
}

.breadcrumbs-sep {
  color: var(--gold);
  opacity: 0.7;
}

.breadcrumbs-current {
  color: var(--ink);
  font-weight: 500;
}

/* ---------- Layout tools ---------- */
.section {
  padding: 4rem 0;
}

.section-head {
  max-width: 42rem;
  margin-bottom: 2.5rem;
}

.section-title {
  font-family: var(--font-title);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  color: var(--ink);
  margin-bottom: 0.75rem;
}

.section-description {
  color: rgba(27, 42, 39, 0.7);
  font-size: 1rem;
  line-height: 1.75;
}

.grid-2,
.grid-3 {
  display: grid;
  gap: 1.5rem;
}

.divider {
  height: 1px;
  border: none;
  background: linear-gradient(90deg, var(--gold) 0%, var(--mist) 100%);
  margin: 2.5rem 0;
}

/* ---------- Editorial split ---------- */
.editorial-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem 2.5rem;
}

@media (min-width: 768px) {
  .editorial-split {
    grid-template-columns: minmax(0, 1fr) 2.2fr;
    align-items: start;
  }
}

/* ---------- Cards ---------- */
.card,
.data-card {
  background: var(--white);
  border: 1px solid var(--mist);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

.data-card {
  border-top: 3px solid var(--gold);
}

.card-title {
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.card-meta {
  font-size: 0.8rem;
  color: rgba(27, 42, 39, 0.55);
  letter-spacing: 0.05em;
}

.card-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 500;
  color: var(--primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

/* ---------- Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: 999px;
  border: 1px solid rgba(10, 92, 74, 0.3);
  color: var(--primary);
  background: rgba(10, 92, 74, 0.06);
  line-height: 1.5;
  white-space: nowrap;
}

.tag--gold {
  background: rgba(201, 162, 39, 0.14);
  border-color: var(--gold);
  color: #8C6D1A;
}

.tag--crimson {
  background: rgba(142, 58, 43, 0.08);
  border-color: var(--crimson);
  color: var(--crimson);
}

.tag--yellow {
  background: rgba(245, 197, 24, 0.22);
  border-color: var(--bright-yellow);
  color: #8A6D00;
}

/* ---------- Callout ---------- */
.callout {
  background: var(--cream);
  border-left: 4px solid var(--gold);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.925rem;
  line-height: 1.75;
  margin: 1.5rem 0;
}

/* ---------- Eyebrow ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--vermilion);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--vermilion);
  flex-shrink: 0;
}

.eyebrow-vertical {
  writing-mode: vertical-rl;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--vermilion);
}

/* ---------- Stat ---------- */
.stat {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--crimson);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- Media frame ---------- */
.media-frame {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--mist);
  aspect-ratio: 16 / 9;
}

.media-frame > img,
.media-frame > picture,
.media-frame > video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--portrait {
  aspect-ratio: 3 / 4;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

/* ---------- Tabs ---------- */
.tabs {
  display: block;
}

.tabs-nav {
  display: flex;
  gap: 0.25rem;
  border-bottom: 2px solid var(--mist);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs-nav::-webkit-scrollbar {
  display: none;
}

.tabs-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.925rem;
  font-weight: 600;
  color: rgba(27, 42, 39, 0.55);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  cursor: pointer;
  margin-bottom: -2px;
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.tabs-tab:hover,
.tabs-tab:focus-visible {
  color: var(--primary);
  background: rgba(10, 92, 74, 0.05);
}

.tabs-tab[aria-selected="true"] {
  color: var(--primary);
  background: var(--white);
  border-color: var(--mist);
  border-bottom-color: var(--white);
  box-shadow: 0 -2px 8px rgba(27, 42, 39, 0.04);
}

.tabs-panel {
  background: var(--white);
  border: 1px solid var(--mist);
  border-top: none;
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
  padding: 1.5rem;
}

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem 2.5rem;
  }

  .footer-col-brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.3fr);
    gap: 2.5rem;
  }

  .footer-col-brand {
    grid-column: auto;
  }
}

@media (min-width: 961px) and (max-width: 1160px) {
  .nav-list {
    gap: 0;
  }

  .nav-link {
    padding: 0.5rem 0.4rem;
    font-size: 0.9rem;
  }

  .site-nav {
    gap: 0.75rem;
  }

  .header-download {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    flex-basis: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0 0 1.25rem;
  }

  .site-nav[data-open] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item + .nav-item {
    border-top: 1px solid rgba(245, 240, 230, 0.08);
  }

  .nav-link {
    display: block;
    padding: 0.8rem 0.25rem;
    font-size: 1rem;
  }

  .nav-link::after {
    left: 0.25rem;
    right: auto;
    width: 2rem;
  }

  .header-download {
    margin: 1rem 0 0;
    min-height: 44px;
  }
}

@media (max-width: 480px) {
  .site-brand-tagline {
    display: none;
  }

  .site-brand-name {
    font-size: 1.2rem;
  }

  .site-brand-mark {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
}

/* ---------- Focus & reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .scroll-progress {
    display: none;
  }
}